That's a great question and a very common concern for anyone buying outdoor bins. The short answer is: it depends entirely on the quality and material of the trash can. Not all plastic trash cans are created equal when it comes to sun exposure.
Most reputable manufacturers of outdoor-rated trash cans do build in UV (ultraviolet) stabilizers or protectants into the plastic resin during production. This additive acts like sunscreen for the plastic, significantly slowing down the degradation and fading process caused by the sun's harsh rays. So yes, many plastic outdoor trash cans are UV protected specifically to prevent them from becoming brittle, cracking, and losing their color quickly.
However, this protection isn't always permanent. Over many years of intense, direct sunlight, even UV-protected bins may experience some gradual fading. The rate depends on factors like the quality and concentration of the UV inhibitors, the pigment used for color, and your local climate. A cheap, thin plastic bin labeled for "outdoor use" might fade or become brittle within a season or two, while a high-density polyethylene (HDPE) bin with premium UV inhibitors can retain its color and strength for many years.
To ensure you get a fade-resistant bin, look for product descriptions that explicitly mention "UV protected," "UV resistant," "sun-resistant," or "weatherproof." Materials like HDPE are naturally more durable. For added longevity, placing the can in a shaded area or using a protective cover can make a big difference. So, while fading is a possibility with prolonged exposure, choosing a well-made, UV-protected trash can is the best way to keep your outdoor space looking tidy for the long haul.